Improved car-spring



M. R. DAND- Car Spring.

Patented Oct. 19, 1.869.

tinned fitalzez Letters Patent No. 95,885, dated October 19, 1869.

The Schedule referred to in these Letters Patent and making part of the same,

To all whom; it may concern.-

Be itkuown that I, MITCHELL R. DAND, of the city and county of Philadelphia, and State of Pennsylvania, have invented a new and useful Spring for Cars and other vehicles; and I do hereby declare that the following is a full, clear, and exact description thereof, sufiicient to enable others skilled in the art to which my invention appertains, to make and use the same, reference being bad to the accompanying drawings, making a part of this which- Figure 1 is a side view of the spring, and the grooved plate which is fixed to the under side of the car, forming a bearing-surface and guide for the upper part of the spring.

Figure 2 is a top view of the spring detached.

Figure 3, an end view of the grooved bearing-plate.

Figure 4, a plan view of the blank before it is coiled. v

The object of this invention is to provide a spring which will become stronger or exert more resistance as the weight upon it increases.

The invention consists .in coiling a strip, bar, or piece of metal, of peculiar form, so as to have each end project from the coiled portion, the lower end being bolted to the truck, while the upper end moves in a groove in a platewhich is secured to the under side of the car.

My invention will be fully understood by reference to the accompanying drawings, considered in connection with the following description.

In the drawings' A represents the blank of which the spring is made.

This blank is made of steel, and is coiled, as shown in figs. 1 and 2, so as to form the horizontal portion a, the coil 1), and the inclined part 0.

These blanks may be rolled in the usual way, and then coiled on a mandrel.

The springs are secured to the top of the truck by bolts passing through holes in the part a. Any desired number of springs may be used on each truck.

On small trucks, four will be suflicient, arranged on the sides, one near each end.

The springs are faced inward, and, as before stated, are bolted to the trucks, the coiled parts b resting in specification, .in

sockets'in the frame of the truck, thus allowing the spring to set square.

B is a plate, having a wide longitudinal groove in one face, as shown in fig. 3. This plate is bolted to the under side of the body of the car, with the grooved side down.

The upper part of the spring, which is made straight, as at d, fits in the groove 0 of plate B.

The plates B are not placed directly over the coiled portions 1) of the springs, but are arranged relatively thereto, as shown in fig. 1, thus materially reducing the friction.

The plates B form bearing-surfaces for the parts ll of the springs, which are guided therein by the sides It will be seen, that as the wheels pass over inequalities, the ends (I, of the springs, move back and. forth in the grooves of the plates B, and thereby jars and shock are not communicated to the body of the car.

As the weight of the body of the car increases, the parts 0 are depressed, audthe tendency is to bring the coils closer together and make them sustain the weight. Thus, the strength or resistance of the spring is increased as the weight upon it increases.

It is obvious, that my improved spring is very sim ple as well as practical. It is easily applied to all classes of cars, old and new, and operates satisfactorily.

Having thus described my invention,

What I claim as new,'and desire to secureby Letters Patent, is-

1. The spring, made substantially as shown and described, from the blank A, with the coils 1), straight part a, and inclined portions 0 (I, for the purposes specified.

2. The grooved plate B, in combination with the spring, arranged substantially as and for the purpose set forth. I

To the above, I have signed my name, this 17th day of February, 1869.

v M. R. DAND.

\Vitnesscs:

W. A. Wrnnnnsnnnu, H. M. WIEDERsHEIM. 

